<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
    </head>
    <body>
        <a id="abc">跳转到这里</a>
        <input type="text" 绍="自我介绍" value="我是czk">

        <br>
        <button type="button" onclick="alert('注册成功')">注册</button>
        <button type="button" onclick="alert('登陆成功')">忘记密码</button>
        <button type="button" onclick="alert('54188')">发送验证码</button><br>
        性别<br>
        <input type="radio" name="sex" value="male" checked>Male
        <input type="radio" name="sex" value="female">Female<br>
        爱好<br>
        <input type="checkbox">刷抖音
        <input type="checkbox">睡觉
        <input type="checkbox">干饭
        <input type="checkbox">其他<br>
        下拉<br>
        <select>
            <optgroup>
            <option>1</option>
            <option>2</option>
            <option>3</option>
            <option>4</option>
            </optgroup>
            <optgroup>
                <option>5</option>
                <option>6</option>
                <option>7</option>
                <option>8</option>
            </optgroup>
        </select>
    </body>
</html>